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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfbb470ea50fd8811b4ce3db7ded086e48cf65ef5719bcca98cce03623e9347c' 
  AND token = 'WJX1dpvM3tJfJsKmVpr1z2xnbsuFwdmelzxnuXvw/bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}